model HollowCylinderRadialFlux "Hollow cylinder with radial flux; fixed shape; linear or non-linear material characteristics"
extends FluxTubes.Interfaces.PartialFixedShape;
parameter SI.Length l = 0.01 "Width (orthogonal to flux direction)"
annotation (Dialog(
group = "Fixed geometry",
groupImage = "modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/HollowCylinderRadialFlux_qs.png"));
parameter SI.Radius r_i = 0.01 "Inner radius of hollow cylinder"
annotation (Dialog(group = "Fixed geometry"));
parameter SI.Radius r_o = 0.02 "Outer radius of hollow cylinder"
annotation (Dialog(group = "Fixed geometry"));
parameter Modelica.SIunits.Angle alpha = 2 * Modelica.Constants.pi "Central angle";
equation
A = l * pi * (r_o + r_i);
G_m = 2 * pi * mu_0 * mu_r * l / Modelica.Math.log(r_o / r_i) * alpha / (2 * Modelica.Constants.pi);
annotation (Documentation(info = "<html>\n<p>The radial cylinder model is characterized by the outer diameter, <img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/r_o.png\"/>, the inner diameter, <img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/r_i.png\"/>, length, <img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/l.png\"/>, and the angle <img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/alpha.png\"/>. The magnetic reluctance is determined by:</p>\n<p><img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/R_m_radial.png\"/></p>\n<p>In this model the magnetic flux and the magnetic potential difference, respectively, are radially oriented.</p>\n<p><img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/HollowCylinderRadialFlux_qs.png\"/></p>\n<p>The above figure left shows a radial flux cylinder with <img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/alpha2pi.png\"/>. The figure on the right indicates the central angle <img src=\"modelica://Modelica/Resources/Images/Magnetic/QuasiStatic/FluxTubes/alpha.png\"/> in case a cylinder section shall be considered.</p>\n</html>"));
end HollowCylinderRadialFlux;